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Detailed simulations have been developed for a full year of performance using a commercial finite volume computational fluid dynamics (CFD) code (©ANSYS-CFX).
Errors in outlet fluid temperature and surface borehole temperature have been estimated for the whole year of simulation.
Two heat exchangers with 25 m and 100 m depth have been simulated in detailed in transient regime by using a commercial finite volume CFD code (©ANSYS-CFX).
The use of a CFD modelling avoids the additional error introduced by the use of convection correlations.
A review of ground coupled heat pump models used in whole-building computer simulation programs.

It indicates that the DEM method may be used as a powerful tool for the simulation of the gas-solid flow.
With the development of the computer technology, the computational fluid dynamics (CFD) has developed rapidly, which provide low-cost and high efficient design method [5-7].
Generally speaking, there are two methods for gas-solid two-phase flow simulation, namely Lagrangian and Eulerian approaches.
The CFD-DEM method is used to simulate the hydrodynamic character of gas-solid flow in fluidized bed.
It is shown that with the flexibility and accuracy, the DEM-CFD is a valuable direction for the dense gas-solid flow simulation Acknowledgements This work was financially supported by the National Natural Science Foundation of China (51006106) and the National High Technology Research and Development of China 863 Program (2006AA05A103).

Therefore, technical analysis and model simplification are necessary when we use CFD to do the analysis.
CFD simulation analysis Current research of Natural ventilation focuses on the design of natural ventilation with traditional experiences, most of which are qualitative design, lack of quantitative analysis results of energy-saving.
Currently, there is wind tunnel simulation and CFD used in quantitative analysis, with the development of computer technology, CFD has been widely used for its inexpensive and convenient way.
This simulation is based on the ground floor of Wenyuan Building, in the middle is the corridor, on both sides of which are symmetric classrooms.
Through above simulation experiment, we have a quantitative visual simulation of air velocity field and air-age distributions in different high levels as well as have a comprehensive and more intuitive understanding of principle of natural ventilation of modified Wenyuan Building.

The Reynolds Averaged Navier Stokes equations is solved by a commercial CFD program, FLUENT.
The commercial CFD program-Fluent is widely used to calculate fluid flow and heat transfer problem.
Other grid numbers are sent according to mesh quality and simulation time.
The velocity magnitude can be estimated by primary simulation.
A primary simulation of seal with 50% accentricity was conducted.

Research on Sand-blocking Mechanism of Fence Based on CFD Technology Zhi-Qiang Wanga,*,Zhi-Gui Qinb,Zhi-Kang Lic,Yi-Feng Hed,Bao-Feng Fue Northwest Institute of Nuclear Technology,Xi’an 710024,China azhiqwang@163.com, btuyi2000@sina.com, clizhikang@126.com, dheyifeng236@yahoo.com.cn, efbfeng_1988@sina.com Keywords: Sand prevention control;Sand-blocking fence;Numerical simulation Abstract.
The airflow field and sand movement path around fences of 0 and 40% porosity are of numerical calculation by CFD technology and the sand-blocking mechanism of fence is analyzed comprehensively.
Based on CFD technology, the wind field and sand movement path near the fence are calculated by numerical simulation respectively, the main factors influencing the sand deposit are analyzed combined the two and the sand-blocking mechanism of fence is analyzed more comprehensively in this paper.
Research Method 1.1 Numerical simulation At present, there are two research methods of the two-phase flow of wind sand: Euler-Euler method and Euler-Lagrange method.
This research further deepens the understanding of the sand-blocking mechanism of fence and also reflects the potential of CFD technology in studying wind-sand movement.

Numerical Investigation on the Effect of Abrasive Property for Abrasive Flow Machining Li-feng YANG a, Chun-yan DONG b and Wei-na LIU c Department of Mechanical Engineering, Changchun University of Science and Technology, Changchun, Jilin Province 130022, China aemail:yanglf55@163.com ,bemail:dongcy03@foxmail.com, cemail:wnliu77@163.com Keywords: abrasive; volume fraction; aperture; CFD.
The simulation results show that the lower particle volume fraction may be in favour of the metal removal uniformity, but the processing time will be too long if too low fraction is selected.
The research on the AFM process of cylindrical runner by FLUENT simulation, and analyzes the different abrasive particle volume fraction machining different aperture cylindrical runner.
A study of abrasive waterjet characteristics by CFD simulation.Journal of Materials Processing Tech. 2004, Vol.153 , pp.488-493
Lim .Process modeling and CFD simulation of two-way abrasive flow machining.The International Journal of Advanced Manufacturing Technology, 2014, Vol.71(5-8), pp.1077-1086

Simulations have also been used for improving and optimizing process equipment and growth conditions.
Models implemented in the context of computational fluid dynamics (CFD) have successfully been used to simulate both gas-phase and surface chemistry for epitaxial growth of SiC by CVD [[] Ö.
Simulations were done for varying inlet C/Si ratios, with a constant inlet mole fraction of SiH4.
With this simplification, the only necessary input to the CFD simulations is the sticking probability for each molecule.
Summary CFD simulations have been performed to predict growth rates for varying C/Si ratios.

The validated method was adopted in the numerical simulation, the wind tunnel test were carried out in order to validate the results of numerical simulation.
With the development of computer, the CFD software are widely applied on the simulation around automobile, but its astringency and precision need increase.
The result of simulation is 0.373, the result of test is 0.360, and the error is 3.6%.the result of simulation is adjacent to the test result.
The flow lines of test were analyzed contrast with results of CFD to validate the correctness of simulation results.
Aerodynamics of a Pickup Truck: Combined CFD and Experimental Study[C].

The results of the simulation are shown in Fig. 3.
According to that, CFD (Computational Fluid Dynamics) simulation programs were used to map the material flow and subsequent form filling optimisation [5].
Temperature in °C Fig. 3: Thermal design of the forming tool using FEM simulation (left).
Fluidic design of the forming tool for an artificial hip joint, using CFD simulation (right) Material constants are used to allow for the material-specific, fluid dynamic properties in the semi-solid state.
Figure 3 (right) shows the form filling of the artificial hip joint, calculated by CFD simulation (blank part geometry: D=40mm x H=50mm, blank part temperature: JR=1630°C, tool temperature: Jtool=600°C to ~650°C ram speed: 400 mm/s) and the dynamic viscosity characteristic in [Pa∙s] for a TiAl6V4 alloy.

We also examined how the air exchange rate of the room, the loading factor of the sorptive materials, and the mass transfer coefficient influenced the sorptive performance; these effects were well reproduced experimentally with computational fluid dynamics (CFD) simulations.
Table 1 shows the details of the cases considered in the CFD analysis.
The boundary conditions for the CFD analysis are given in Table 2.
Model used for CFD analysis Fig. 2.
Cases considered in CFD analysis Case Temp.